That girl is a friend of( ) A.Mary's sister' B.Mary sister's C.Mary 's sister's D.sister of Mary's
Jim was late for two classes this morning.He said that he forgot both of the ( ).
A.room's number B.room number C.room's numbers D.room numbers
"Excuse me ,where are ( ) offices " "Over there."
A.teacher 's B.teachers C.the teachers D.the teachers'